2
VAREC SERIES 180/181 DOUBLE PORT REGULATOR
InstallatIon, operatIon and maIntenance InstructIons
CONSTRUCTION
1. Standard materials of construction include
a cast aluminum body and galvanized steel
diaphragm housing, reinforced NBR rubber
diaphragm and 304 stainless steel plugs,
seats and other trim. Special materials such
as cast iron or cast steel valve bodies or
PTFE diaphragms are also available.
2. Connections are NPT threaded on sizes
½" through 1½". Connections are flanged,
drilled to 125 PSI ANSI requirements on
sizes 2" through 8". Aluminum or iron valve
bodies are provided with flat face flanges,
while steel bodies are provided with raised
face flanges.
INSTALLATION
Series 180/181 regulators must be installed in
an upright position in a horizontal pipeline, as
shown on the reference drawing. Flow through
the valve must be in the direction indicated by
the arrow on the valve body. The valve should
be located free of contact with any adjacent
equipment or pipelines. Connection piping
should be fitted accurately to be gas tight
without strain on the valve body or diaphragm
housing.
It is recommended that stop valves be installed
in upstream and downstream piping and in the
control line to the regulator to permit taking
the regulator off the line for maintenance
purposes. Regulators having screwed
connections should have all pipe lines fitted
with ground joint unions located between the
stop valves and the regulator.
Control line piping should be 2” size and
should be connected to downstream piping
as far downstream as possible, preferably to
the location at which the pressure control is
desired. Minimum should never be less than
10feet from the regulator. Control piping
should be fitted accurately to be gas tight
without strain on the diaphragm housing and
should be supported firmly.
All upstream, downstream and control pipe
lines should be cleaned thoroughly prior to
installing the regulator.
Unboxing and handling
Particular care should be exercised in unboxing
and handling regulators. Bending of control
mechanism, strain to diaphragm or changing
position of balance weights will result in
unsatisfactory operation.
When handling, grasp and support only by
the valve body. Do not handle by grasping the
diaphragm housing, linkage mechanism or
weight arm.
After unboxing, inspect to insure against
presence of dirt or other foreign matter. Also,
check valve seats and plugs for cleanliness and
freedom of operation.
Adjustment
Varec Series 180/181 regulators are shipped
from the factory fully assembled and preset
to operate at the customers specified setting.
Further adjustment should not be necessary.
However, if it should become necessary to
change from the factory setting, the procedure
detailed on page 3 should be followed.